* ALSA Mixer issue @ 2010-07-30 13:23 sudarshan bisht 2010-07-30 13:30 ` Jaroslav Kysela 0 siblings, 1 reply; 5+ messages in thread From: sudarshan bisht @ 2010-07-30 13:23 UTC (permalink / raw) To: alsa-devel Hi , I wanted to know that can we use multiple handlers for the same ALSA mixer ? My use case is something like this . I have two modules and having two different handlers for ALSA mixer. First module does some volume change , and I try to read the latest volume using my second handler ( of first second module) . But I am not getting the most recent value in second handler ( the volume set by the first module ) so I feel there is some inconsistency when I use two handlers from two different modules in order to fetch volume information from the ALSA mixer. -- Regards, Sudarshan Bisht ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: ALSA Mixer issue 2010-07-30 13:23 ALSA Mixer issue sudarshan bisht @ 2010-07-30 13:30 ` Jaroslav Kysela 2010-07-30 14:36 ` sudarshan bisht 0 siblings, 1 reply; 5+ messages in thread From: Jaroslav Kysela @ 2010-07-30 13:30 UTC (permalink / raw) To: sudarshan bisht; +Cc: alsa-devel On Fri, 30 Jul 2010, sudarshan bisht wrote: > Hi , > > I wanted to know that can we use multiple handlers for the same ALSA mixer ? > > My use case is something like this . > > I have two modules and having two different handlers for ALSA mixer. First > module does some volume change , and I try to read the latest volume using > my second handler ( of first second module) . > > But I am not getting the most recent value in second handler ( the volume > set by the first module ) so I feel there is some inconsistency when I use > two handlers from two different modules in order to fetch volume information > from the ALSA mixer. You must sync the cached information using poll() or select() on file descriptors returned by snd_mixer_poll_descriptors_*() functions and call snd_mixer_handle_events() if any events are waiting. Jaroslav ----- Jaroslav Kysela <perex@perex.cz> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: ALSA Mixer issue 2010-07-30 13:30 ` Jaroslav Kysela @ 2010-07-30 14:36 ` sudarshan bisht 2010-08-03 7:35 ` sudarshan bisht 0 siblings, 1 reply; 5+ messages in thread From: sudarshan bisht @ 2010-07-30 14:36 UTC (permalink / raw) To: Jaroslav Kysela; +Cc: alsa-devel Thanks for the reply , I will try the same soon . On Fri, Jul 30, 2010 at 7:00 PM, Jaroslav Kysela <perex@perex.cz> wrote: > On Fri, 30 Jul 2010, sudarshan bisht wrote: > > Hi , >> >> I wanted to know that can we use multiple handlers for the same ALSA mixer >> ? >> >> My use case is something like this . >> >> I have two modules and having two different handlers for ALSA mixer. >> First >> module does some volume change , and I try to read the latest volume using >> my second handler ( of first second module) . >> >> But I am not getting the most recent value in second handler ( the volume >> set by the first module ) so I feel there is some inconsistency when I >> use >> two handlers from two different modules in order to fetch volume >> information >> from the ALSA mixer. >> > > You must sync the cached information using poll() or select() on file > descriptors returned by snd_mixer_poll_descriptors_*() functions and call > snd_mixer_handle_events() if any events are waiting. > > Jaroslav > > ----- > Jaroslav Kysela <perex@perex.cz> > Linux Kernel Sound Maintainer > ALSA Project, Red Hat, Inc. > > -- Regards, Sudarshan Bisht ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: ALSA Mixer issue 2010-07-30 14:36 ` sudarshan bisht @ 2010-08-03 7:35 ` sudarshan bisht 2010-08-06 8:05 ` sudarshan bisht 0 siblings, 1 reply; 5+ messages in thread From: sudarshan bisht @ 2010-08-03 7:35 UTC (permalink / raw) To: Jaroslav Kysela; +Cc: alsa-devel Thanks Jaroslav , It works for me !!! On Fri, Jul 30, 2010 at 5:36 PM, sudarshan bisht <bisht.sudarshan@gmail.com>wrote: > Thanks for the reply , I will try the same soon . > > On Fri, Jul 30, 2010 at 7:00 PM, Jaroslav Kysela <perex@perex.cz> wrote: > >> On Fri, 30 Jul 2010, sudarshan bisht wrote: >> >> Hi , >>> >>> I wanted to know that can we use multiple handlers for the same ALSA >>> mixer ? >>> >>> My use case is something like this . >>> >>> I have two modules and having two different handlers for ALSA mixer. >>> First >>> module does some volume change , and I try to read the latest volume >>> using >>> my second handler ( of first second module) . >>> >>> But I am not getting the most recent value in second handler ( the volume >>> set by the first module ) so I feel there is some inconsistency when I >>> use >>> two handlers from two different modules in order to fetch volume >>> information >>> from the ALSA mixer. >>> >> >> You must sync the cached information using poll() or select() on file >> descriptors returned by snd_mixer_poll_descriptors_*() functions and call >> snd_mixer_handle_events() if any events are waiting. >> >> Jaroslav >> >> ----- >> Jaroslav Kysela <perex@perex.cz> >> Linux Kernel Sound Maintainer >> ALSA Project, Red Hat, Inc. >> >> > > > -- > Regards, > > Sudarshan Bisht > -- Regards, Sudarshan Bisht ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: ALSA Mixer issue 2010-08-03 7:35 ` sudarshan bisht @ 2010-08-06 8:05 ` sudarshan bisht 0 siblings, 0 replies; 5+ messages in thread From: sudarshan bisht @ 2010-08-06 8:05 UTC (permalink / raw) To: Jaroslav Kysela; +Cc: alsa-devel Hi Jaroslav , It works fine in my Linux PC but when I try to run same on my target device , it gets into infinite loop and never comes out of poll function. Any suggestion to make it work on target device ? On Tue, Aug 3, 2010 at 10:35 AM, sudarshan bisht <bisht.sudarshan@gmail.com>wrote: > Thanks Jaroslav , > > It works for me !!! > > > > On Fri, Jul 30, 2010 at 5:36 PM, sudarshan bisht < > bisht.sudarshan@gmail.com> wrote: > >> Thanks for the reply , I will try the same soon . >> >> On Fri, Jul 30, 2010 at 7:00 PM, Jaroslav Kysela <perex@perex.cz> wrote: >> >>> On Fri, 30 Jul 2010, sudarshan bisht wrote: >>> >>> Hi , >>>> >>>> I wanted to know that can we use multiple handlers for the same ALSA >>>> mixer ? >>>> >>>> My use case is something like this . >>>> >>>> I have two modules and having two different handlers for ALSA mixer. >>>> First >>>> module does some volume change , and I try to read the latest volume >>>> using >>>> my second handler ( of first second module) . >>>> >>>> But I am not getting the most recent value in second handler ( the >>>> volume >>>> set by the first module ) so I feel there is some inconsistency when I >>>> use >>>> two handlers from two different modules in order to fetch volume >>>> information >>>> from the ALSA mixer. >>>> >>> >>> You must sync the cached information using poll() or select() on file >>> descriptors returned by snd_mixer_poll_descriptors_*() functions and call >>> snd_mixer_handle_events() if any events are waiting. >>> >>> Jaroslav >>> >>> ----- >>> Jaroslav Kysela <perex@perex.cz> >>> Linux Kernel Sound Maintainer >>> ALSA Project, Red Hat, Inc. >>> >>> >> >> >> -- >> Regards, >> >> Sudarshan Bisht >> > > > > -- > Regards, > > Sudarshan Bisht > -- Regards, Sudarshan Bisht ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2010-08-06 8:05 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2010-07-30 13:23 ALSA Mixer issue sudarshan bisht 2010-07-30 13:30 ` Jaroslav Kysela 2010-07-30 14:36 ` sudarshan bisht 2010-08-03 7:35 ` sudarshan bisht 2010-08-06 8:05 ` sudarshan bisht
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